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Find the general solution : cos 4x = co...

Find the general solution : `cos 4x = cos 2x`

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NCERT ENGLISH-TRIGONOMETRIC FUNCTIONS-All Questions
  1. Prove that cos^2x+cos^2(x+pi/3)+cos^2(x-pi/3)=3/2.

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  2. Find the principal and general solution of cosec x = 2

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  3. Find the general solution : cos 4x = cos 2x

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  4. Find the principal and general solution of sec x = 2

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  5. Find the principal and general solution of cotx=-sqrt(3)

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  6. Find the principal and general solution of tanx=sqrt(3)

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  7. Find the general solution : sin x + sin 3x + sin 5x = 0

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  8. Prove that cos 2xcos(x/2)-cos 3x cos((9x)/2)= sin5x sin((5x)/2).

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  9. Find the value of sin (31pi)/3.

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  10. Find the value of cos (-171 0^(@))

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  11. If cosx=-3/5, x lies m the third quadrant, find the values of other f...

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  12. If cotx=-5/(12), lies in second quadrant, find the values of other fi...

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  13. The minute hand of a watch is 1.5 cm long. How far does its tip move ...

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  14. If the arcs of the same lengths m two circles subtend angles 65oand 1...

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  15. Convert 6 radians into degree measure.

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  16. Find the radius of the circle in which a central angle of 60^@interce...

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  17. Convert 40^o2 0^(prime)into radian measure.

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  18. Find the general solution : cos 3x + cos x cos 2x = 0

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  19. Find the general solution : sin 2x + cos x = 0

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  20. Find the principal solution of the equation tanx=-1/(sqrt(3)).

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